Thanks, Ready. Neither cat will eat the prescription food. My cat is horrible about subQ fluids and my mother in law is afraid to try with her cat, so that option isn't working either. I have been adding hot water to the wet food to get extra fluid into mine. She's somewhere between 18-20. We adopted her as an adult from a shelter almost 17 years ago. My mother in law's cat is even older. So, it's not like this is a huge shock or anything; just very sad.